Progress on the Astrometric Gravitation Probe design

Mario Gai; Alberto Vecchiato; Alberto Riva; Mario Gilberto Lattanzi; Federico Landini; Beatrice Bucciarelli; Deborah Busonero; Mariateresa Crosta; Shilong Liao; Hao Luo; Giovanni Mana; Marco Pisani; Zhaoxiang Qi; Carlo Paolo Sasso; Zhenghong Tang; Yu Yong

doi:10.1117/12.2562644

13 December 2020 Progress on the Astrometric Gravitation Probe design

Mario Gai, Alberto Vecchiato, Alberto Riva, Mario Gilberto Lattanzi, Federico Landini, Beatrice Bucciarelli, Deborah Busonero, Mariateresa Crosta, Shilong Liao, Hao Luo, Giovanni Mana, Marco Pisani, Zhaoxiang Qi, Carlo Paolo Sasso, Zhenghong Tang, Yu Yong

Author Affiliations +

Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 114430N (2020) https://doi.org/10.1117/12.2562644
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

The Astrometric Gravitation Probe mission is a modern version of the 1919 Dyson-Eddington-Davidson experiment, based on a space-borne telescope with a permanent built-in eclipse, provided by a coronagraphic system. The expected improvement on experimental bounds to General Relativity and competing gravitation theories is by at least two orders of magnitude. The measurement principle is reviewed, in particular the principle of Fizeau-like combination of a set of individual inverted coronagraphs simultaneously feeding a common high resolution telescope. Also, the payload has a dual field of view property, in order to support simultaneous observations of stellar fields either very close, or far away, from the Sun, i.e. fields affected by either high or low light bending. We discuss a set of solutions introduced in the optical design to improve on technical feasibility and robustness of the optical performance against perturbations, in particular induced by manufacturing and alignment tolerances, and launch stresses.

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Mario Gai, Alberto Vecchiato, Alberto Riva, Mario Gilberto Lattanzi, Federico Landini, Beatrice Bucciarelli, Deborah Busonero, Mariateresa Crosta, Shilong Liao, Hao Luo, Giovanni Mana, Marco Pisani, Zhaoxiang Qi, Carlo Paolo Sasso, Zhenghong Tang, and Yu Yong "Progress on the Astrometric Gravitation Probe design", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 114430N (13 December 2020); https://doi.org/10.1117/12.2562644

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